NDLI: Light splitting function of branched chains of transparent microspheres

Content Provider	IEEE Xplore Digital Library
Author	Mitsui, T. Wakayama, Y. Onodera, T. Hayashi, T. Ikeda, N. Sugimoto, Y. Takamasu, T. Oikawa, H.
Copyright Year	2010
Description	Author affiliation: NI Center, National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki 305-0047, Japan (Ikeda, N.; Sugimoto, Y.) \|\| AEM Center, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan (Wakayama, Y.) \|\| IMRAM, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan (Onodera, T.; Hayashi, T.; Oikawa, H.) \|\| QDR Center, National Institute for Materials Science, Sakura 3-13, Tsukuba, Ibaraki 305-0003, Japan (Mitsui, T.; Takamasu, T.)
Abstract	To observe optical properties of propagation light through branched coupled-resonator optical waveguides (CROWs), we fabricated ordered chains of transparent microspheres that have 30°- and 60°-branched structures on a lithographically patterned substrate using a self-assembly process. The spectra of propagation light within the chains were directly measured by guide-collection-mode near-field scanning optical microscopy (NSOM) techniques. Moreover, we perform a finite-difference time domain (FDTD) simulation to explain the spectra. The spectrum of light propagating to the 60°-branch shows some sharp peaks, which seem to be associated with whispering gallery modes (WGMs). On the other hand, the spectrum of light propagating to the 30°-branch shows rather broad peaks. The FDTD simulation suggests that the WGM component propagates to both of the 30°- and 60°-branches, and also suggests that almost all of the nanojet-induced mode (NIM) component propagates to the 30°-branch and little propagates to the 60°-branch. Therefore, the most plausible cause of the difference in the NSOM spectra is that the difference in propagation efficiency of the NIM component between the 30°- and 60°-branches. These results suggest that the microspheres' branching chain itself has a splitting function, which is a kind of wavelength-selective filters.
Starting Page	1
Ending Page	4
File Size	1538953
Page Count	4
File Format	PDF
ISBN	9781424477999
e-ISBN	9781424477982
e-ISBN	9781424477975
DOI	10.1109/ICTON.2010.5548971
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-06-27
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical propagation Optical resonators Optical waveguides Optical filters High speed optical techniques Optical scattering Optical microscopy Materials science and technology Optical coupling Self-assembly NSOM Whispering-gallery modes Nanojet-induced mode CROWs colloids self-assembly
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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